Probes POST to apps

- App takes POST report on /api/report
- Probe publishes to configured target(s)
- Name resolution happens on probe-side
- There's no longer an xfer.ProbePort
- xfer.Collector responsibility is reduced
- Fixes to remaining experimental components.
- rm experimental/bridge: it's not being used, and by changing the
  app/probe comm model, it would require a complete refactor anyway. We
  can easily rebuild it when we need to. It will even be much simpler.
- rm experimental/graphviz: it's broken for some time anyway, and we
  don't really need to play around with it as a rendering option
  anymore.
- rm experimental/oneshot: we never use this anymore.

docker/entrypoint.sh

@@ -54,10 +54,10 @@ if [ -n "$DNS_SERVER" -a -n "$SEARCHPATH" ]; then
 fi
 
 # End of the command line can optionally be some
-# addresses of probes to connect to, for people not
-# using Weave DNS.  We stick these in /etc/weave/probes
-# for the run-app script to pick up.
-MANUAL_PROBES=$@
-echo "$MANUAL_PROBES" >/etc/weave/probes
+# addresses of apps to connect to, for people not
+# using Weave DNS. We stick these in /etc/weave/apps
+# for the run-probe script to pick up.
+MANUAL_APPS=$@
+echo "$MANUAL_APPS" >/etc/weave/apps
 
 exec /sbin/runsvdir /etc/service

docker/run-app

@@ -1,3 +1,3 @@
 #!/bin/sh
 
-exec /home/weave/scope-app $(cat /etc/weave/scope-app.args) $(cat /etc/weave/probes)
+exec /home/weave/scope-app $(cat /etc/weave/scope-app.args)

docker/run-probe

@@ -1,3 +1,3 @@
 #!/bin/sh
 
-exec /home/weave/scope-probe $(cat /etc/weave/scope-probe.args)
+exec /home/weave/scope-probe $(cat /etc/weave/scope-probe.args) $(cat /etc/weave/apps)